Links

Images

Classifications

B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL

B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR

B27B17/00—Chain saws; Equipment therefor

B27B17/06—Chain saws mounted on a bow

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC

Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T83/00—Cutting

Y10T83/707—By endless band or chain knife

Y10T83/7226—With means to guard the tension

Y10T83/7239—With means to vary distance between pulley or sprocket axes

Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

My present invention relates to a portable power driven apparatus for sawing trees and logs, and aims to provide a simple, compact, durable and eflicient machine capable of being easily handled by a couple of operators to rapidly and expeditiously cut logs or trees irrespective of'the position, and one which can be readily conveyed from place to place.

The invention includes the novel features of construction and arrangement and combination of parts hereinafter described, the

, invention being defined by the appended claims.

In order that my invention may be better understood I have appended hereto several sheets of drawings illustrating several forms of my invention, in which drawings Figure 1 is a plan view illustrating the 20 preferred embodiment of my invention.

Fig. 2 is an enlarged transverse sectional iew of the motor en Fig. 3 is an enlarged sectional detail of the opposite end.

Fig. 10 is a side elevation of a portion of chain saw used in this form of apparatus. Fig. 11 is a view similar to Fig. 1, but showing a modification.

Fig. 12 is a detail view showing the idler of Fig. 11 partly in side elevation and partly broken away.

Fig. 13 shows in side elevation a section of a chain saw suitable foruse in this form of, my invention.

Fig. 14 shows a section ofthe saw on the line 14-14, Fig. 13.

view of the outer end Referring by'refe'rence characters tothese drawings, the numerals land 2 designate preferably :hollow and square frame bars, in cross section,-which areadjustably pivoted together. and which support at their outer ends the pulleys forj carrying and Fig. 15 is a section 9 of Fig.'

Application filed April 23, 1921. Serial No. 468,830.

driving the chain saw 3 in the manner hereinafter described.

The frame bars 1 and 2 are preferably connected by providing them with socket members 1 and 2 in which the ends of the bars are rigidly held, which socket members are provided with overlapping plate or disc members. having serrated faces bolted to gether by means of the bolt a-'.

The ends of both frame bars 1 and 2 are detachably connected with the chain saw pulley carrying parts to enable them to be readily removed and replaced by longer orshorter bars, according to the sizes of trees tobe operated on.

The form of connection for the end of bar 1 is preferably such as to enable the bar to be adjusted longitudinally for chain tightening purposes to secure finer adjustments than can be obtained by the angular adj ustment of the frame bars relative to each other. e I To this end the frame bar slidably and removably seatsin or engages a square passageway 4 in the frame 4 which carries the idle pulley 5, which pulley 5 supports one end of the loop of the endless chain saw, indicated at 3. The bar 1 has a cut away portion 1 at one side and it is provided with an end cap 1 having a portion telescoping into the end of the bar and held therein by a transverse pin 1. An adjusting screw A lies within the bar and has a reduced end extending through and rotatable in an opening in the end cap, with screw turning. means such as the winged member indicated at A.

The portion of the screw within the bar such end being provided 1 engages the interior threads of a stationary the screw with the stationary nut '13 will nut member B efi'ect longitudinal adjustment of the bar 1,

while by removing or driving out the pin 1 and disconnecting the cap, the frame bar may be removed without disturbing the adjusting means just described.

The idle pulley 5 is journaled upon a shaft 6 carried by the frame member 4, and

guard 8, carried by the-shanks oft-he handles and the saw is kept from contactin with the ground in vertical cutting by a s cc 9,

pivoted at 9' so as to fold upward when desired.

The pulley and chain are preferably of the construction shown inapplication filed.

by me of even date herewith.

The pulley 5 is also preferably provided with an inwardly projecting flange providin an internal annular channel 5, into whic oilmay be fed in any suitable manner and from which it will pass b centrifugal action through ports 5" to t e chain channel -to lubricate the saw.

Oil may be supplied to this channel from tank 0 through pipe 0, provided with cut of! valve 0.

The frame bar 2 carries at its outer or I lower end a coupling member 10 which is provided with a transverse slot 10 designed to hook under or engage a transverse pin 11 carried by the motor frame and forming a detachable pivotal connection.

An intermediate part of the frame bar 2 is adjustably held to the motor frame or casing and mypreferred form of adjustable connection comprises a quadrant 11 carried by the motor frame to which the said intermediate portion of the bar is adjustably clamped.

My preferred form of clamp is illustrated in detail in. Fig. 9 and comprises a swinging member D having ribs 03 designed to engage notches in the segment and having a screw locking clamp (1 designed to cooperate with the segment to hold the ribs in said recesses.

By loosening the screw, the clamp or locking device may beswung out of the Way to permit the bar to be unhooked or disconnected from the motor frame. 1

The motor frame is provided with a bandle E, preferably of' the form shown, and also with a chain guard F.

The motor is preferably an internal combustion engine of. the air cooled type indicated at 12, and is provided with a cooling fan 13 driven from-the engine shaft, as shown in Fig. 2, and provided with a. housing 13f having portions 13- for deflecting the air against the cylinders.

The engine shaft carries pinion 15 which meshes with planetar gears 16-journaled on stub'shafts 16 carr ed by brake drum 17, and the planetary gears in turn mesh with an internal rack or gear 18 fast. on .or

connected to the driving pull 19, which driving pulley is shown as of t e form and construction disclosed in an application filed of even date herewith. The brake drum and'driving pulley are both rotatable about the engine shaft, being journaled as clearly shown in Fig. 2, and the brake drum is encircled by a brake band 1'7 operated by suitable rod and bell crank connections, as shown in Fig. 1,. from the operating lever or handle 19. loose, the brake drum is free to rotate and the planetary ears sim 1y roll around without driving e ect on t e chain pulley, but when the band istightened to hold drum 17 stationary and the planetary gears againstorbital movement, the annular rack' and chain pulle are driven, but at a much re duced speed.

- To enable the apparatus to be properly hen the brake band is steadied and guided, especially at the co-mmencement of the sawing operation, I provide a bar 19 having a knife edge.

This knife is pivoted at its rear end on a bar which may conveniently be formed as an extension of the haiidle, and its free end is yieldingly pressed towards the left by a' slidable rod 3/ under the influence of sprlng In the construction shown in Figs. 11 to 15 inclusive, the idler pulley 5 is mounted on an eccentric 33 carried by the shaft 34 journaled in the support 35, which sup-port is secured to the frame member 1 by the clamping device 36. Secured to the shaft '34. is a crank-arm 37, the turning of which pivotally connected to the support 35 at the point 40 and isheld in position by a clamping nut 41 which engages an extension from the shoe. f

The driving and idler pulleys have a flange 42 to which are riveted two plates 43 which form between them a flaring opening between which the saw 3 travels.

is of such dimensions as to bind upon the saw and thus drive the same by reason of the frictional engagement. The saw itself is The space at the inner portion of said opening angle of the frame bars around which the inactive portion ofthe chain saw passes.

In all the frames shownand described herein, adjustments may be made so as to bring the driving and idler pulleys nearertogether or farther apart. One purpose of this is to enable the operator to use saws of different lengths for' sawing trees of differentsizes. Thus if he is going to a section where the timber is small, he will take along a shorter saw and be able to apply it to the frame, adjusting the frame properly for the length of saw which he may have at hand. In all the forms the peripheries ofthe driven and idler pulleys are entirely exposed so that when the two are sufliciently near together the saw can be put in place by a simple sidewise movement without moving any parts.

In using the saw for felling a tree, an undercut is first sawed out by making two cuts In making these at an angle to one another. cuts the knife edge of the bar :0 is brought into contact with the tree and the pull of the saw, the cutting edge of which travels toward the outer end of the bar 00 draws the apparatus toward the tree so that the knife edge of the bar .12 bites into the tree, thus steadying the mechanism. After this undercut is formed the apparatus is removed to the other side of the tree and a straight saw cut is formed therein directly toward the undercut until the tree falls. This bar a is positioned slightly above the saw so as to be out of line with its travel:

The outer end of the bar 111 is held in forward position by a spring y when the.

apparatus is not in engagement with the tree and is therefore more clearly in sight of the operator during the time when he is positioning the mechanism.

After the sawing is begun, however, it is automatically retracted to the position shown in dotted lines and is therefore nearer the motor so as to enable the maximum length of the saw to be used in cutting. The yielding action ofthis bar 1: due to the presence of the spring 3 also results in a shock absorbing action, relieving the apparatus in case the saw strikes a hard knot or other obstacle.

The form of apparatus shown in Fig. 1 is the-preferred form both as to the frame and as to other features.

As .will be evident to those skilled in the art, my invention permits of various modifications without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

1. A portable apparatus for felling trees and cutting them into-the lengths and the like, comprising a frame, a saw carried 3. A portable apparatus for felling trees and cutting them into the lengths and the like, comprising a frame, a saw carried thereby having an endless travel in one direction, with means for operating it and a knife edge bar supported from said frame and arranged transversely to and projecting beyond the cutting runof the saw, sai knife edge bar having its rear end articulated on a fixed pivot, and a spring for forcing the opposite end towards the cutting zone of the saw.

4. In combination, a saw-frame, a saw blade carried thereby and having an exposed run, and a guiding member-extending substantially at ri ht angles to the exposed run of the saw bla e and having a cutting edge adapted to cut into a tree and to aid in supporting the saw as the blade moves through a tree infelling the same. In testimony whereof I afiix m an S'AMUEL .3 NS.